Add the audio of the original video to the video generated by matlab code.

After running the following code which is trying to generate a new video based on a given video, i lost the original audio in the output video and i want to add this audio to the output, is there any solution for this that i can add it to my code, in other words i want for each frame of the video i want to add the coresponding audio sample.

The code (Just the useful part of the code):

while i1 < v1.NumberOfFrames && i2 < v2.NumberOfFrames && i3< v3.NumberOfFrames && i4 < v4.NumberOfFrames

if i1 < v1.NumberOfFrames

i1 = i1+1;

im = v1.read(i1);

im = imresize(im, [290 290]);

im = imrotate(im,-90);

iim1 = image(im,'XData',[0 0],'YData',[height1/2 - 290/2 height1/2 - 290/2]);

end

if i2 < v2.NumberOfFrames

i2 = i2+1;

im = v2.read(i2);

im = imresize(im, [290 290]);

im = imrotate(im,180);

iim2 = image(im,'XData',[width1/2-290/2 width1/2-290/2],'YData',[0 0]);

end

if i3 < v3.NumberOfFrames

i3 = i3+1;

im = v3.read(i1);

im = imresize(im, [290 290]);

im = imrotate(im,90);

iim3 = image(im,'XData',[width1-290 width1-290],'YData',[height1/2 - 290/2 height1/2 - 290/2]);

end

if i4 < v4.NumberOfFrames

i4 = i4+1;

im = v4.read(i4);

im = imresize(im, [290 290]);

iim4 = image(im,'XData',[width1/2-290/2 width1/2-290/2],'YData',[height1 - 290 height1 - 290]);

end

%frame=im2frame(gcf);

frame=getframe(gcf);

writeVideo(writerObj,frame);

drawnow

Answer 1

[Charu]

Hi Ala, 

To copy the audio from your original input video to the newly created video, you can use the “FFmpeg” command line tool. 

To copy the video from “input_0.mp4” and audio from “input_1.mp4”, use the “-map” option in “ffmpeg” to specify what streams you want as shown in the given example: 

ffmpeg -i input_0.mp4 -i input_1.mp4 -c copy -map 0:0 -map 1:1 -shortest out.mp4 

 

Refer to the given page for detailed information on how to copy audio streams from one video to another: 

https://stackoverflow.com/questions/12938581/ffmpeg-mux-video-and-audio-from-another-video-mapping-issue   

An advantage with this method is as the tool simply copies streams, there is no re-encoding involved, and hence the process is lossless and very fast.